Emil kolben



N. B B L O K H RING ARMATURB. I Patented Aug. '16, 1892.

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UNITED STATES PATENT OFFICE.

EMIL KOLBEN, OF SCHENECTADY, ASSIGNOR TO THE EDISON GENERAL ELECTRICCOMPANY, OF NEYV YORK, N. Y.

RlNG-ARMATU RE.

SPECIFICATION forming part of Letters Patent No. 480,728,

dated August 16, 1892.

Application filed February 8, 1892. Serial No. 420,786. (No model.)

To all whom it may concern.-

Be it known that I, EMIL KOLB E a subject of the Emperor ofAustriallungary, residing at Schenectady, in the county of Schenectadyand State of New York, have invented a certain new and usefulImprovement in Ring- Armatures, of which the following is aspecification.

The present invention relates to ring-armatures, and especially, thoughnot necessarily, to large armatures adapted for use in connection withmultipolar field-magnets. In ma chines of this class the conductors aregenerally large and there are a comparatively few turns or convolutionsin the armature-coil. In the present case each coil which is connectedto a commutator-segment is composed of a single convolution.

- The invention consists in the armature-conductor hereinafterdescribed, in the combination thereof with the armature-core in aparticular manner, and in certain features of construction to bespecified and pointed out in the claims.

In the accompanying drawings, illustrating the improvements, Figures 1and 2 are crosssections of two slightly-different forms of armatures onlines corresponding to m a: of Fig. 3. Fig. 3 is a side view of part ofa ring-armature with conductors connected according to this invention,and Fig. at is a modified form of conductor.

The armature-core 1 is preferably built up of wrought-iron rings placedside by side, as shown in Figs. 1 and 2. Through said core, in adirection parallel with its axis,I drill or punch two series of holesnear the inner and outer peripheries, respectively, said holes beingsufficiently large to receive the armatureconduotors 2 and theirsurrounding insulation 3. The holes in the two series should be equal innumber, and evidently those in the outer series will be farther apartthan those of the inner series.

\Vhen the armature is designed, it should be so arranged that the totalcross-section of iron between the conducting-bars at the outsideperiphery of the armature-core lying immediately under a pole is atleast equal to, if not greater than, the cross-section of the iron inthe armature-body, and in order to reduce the total cross-section ofiron between the bars at the inside periphery and which lie immediatelyunder a pole to as small an amount as practicable the holes should bemade quite near to the inside periphery, so that the cross-section ofthe armature-core left between the holes and the inside periphery willallow but a very small percentage of the total magnetic flux to passfrom pole to pole on the inside periphery, so that only an extremelysmall opposition electro-motive force is set up in these interior bars.On each side of the core is placed an insulating-ring 4, having holesregistering with those in the core, and the insulating tube or coveringaround the conductors extends through said holes in theinsulating-rings, thus more perfectly insulating the conductors. Theends of the conductors are connected by flat strips or bars 5 6. Eachstrip connects a rod in one of the upper holes with a corresponding rodin the lower hole, the connection being such, as indicated in Fig. 3,that a continuous spiral will be formed. The cross-bars 5 6 may besecured to the conductors in several different waysfor example, by nuts7, as indicated in Fig. 1, by riveting, as shown at 8, Fig. 2, or by anordinary solder joint or otherwise.

hen the armature has been built up as described, the two faces formed bythe crossbars 5 6 are finished off and are then adapted to serve ascommutator-surfaces. It will be evident that either of said surfaces maybe left unfinished, if desired. The armature be ing perfectlysymmetrical, when one of these surfaces becomes unduly worn by thecommutator-brushes the other side may be used Without affecting theoperation of the machine, since the armature can be reversed to bringthe opposite side into position to cooperate with the commutator-brushes.

Instead of having the conductors connected by the cross-bars at bothends, I may use U- shaped conductors 9, as shown in Fig. 4,with across-bar 5 at one end only. In this case the bars 5 may serve ascommutator-bars or the cross-conductors formed by the U-conductorsthemselves.

With the armature described it is proposed to employ an externalfield-magnet, the poles being diagrammatically indicated at 10, Fig.

3, although it is evident that the same may be used with internal poles,as indicated at 10. By mounting the conductors as described I provide asymmetrical armature without 5 unnecessary bulk and in which the severalparts are securely and rigidly held in place and one in which theelectrical connections are exceedingly simple, so that they can be madeby an ordinary workman.

What I claim is 1. The combination, in a ring-armature, of an iron corehaving two series of holes through it near the inner and outerperipheries, respectively, and in the direction of its axis, and r5insulated conductors in said holes, the ends of the several conductorsbeing connected to form the armature-coil, substantially as described.

2. The combination, in a ring-armature, of an iron core having twoseries of holes through it near the inner and outer peripheries,respectively, and in the direction of its axis, and insulated conductorsin said holes, the ends of the several conductors being connected to z 5form the armatu re-coil by cross bars or plates forming or adapted toform com mntator-segments, substantially as described.

3. The combination, in an armature, of an iron core andinsulating-washers at both sides 0 thereof, the core and washers havingtwo series of holes through them near their inner and outer peripheries,respectively, and in the direction of the axis of the armature,conductors in said holes, and insulation between the conductors and thecore, the ends of the several conductors being connected across thefaces of the core to form the armature-coil, substantially as described.

4. The combination, in an armature, of an iron core andinsulating-washers at both sides thereof, the core and washers havingtwo series of holes through them ,near their inner and outerperipheries, respectively, and in the direction of the axis of thearmature, conductors in said holes, the ends of the several conductorsbeing connected to form the armature-coil, and insulating-tubes on theconductors and extending into the washers, sub- 'stantially asdescribed.

5. The combination, in a ring-armature, of a core, transverseconductors, and cross or connecting conductors at both sides of the armature, said cross-conductors at both sides being finished or adapted tobe finished to form commutatorsurfaces, substantially as described.

6. An armature having the conductor comprising its coil bare on twoopposite sides of the armature, whereby either side may be employed as acommutator-surface, substantially as described.

7. A symmetrical reversible armature having the conductor comprising itscoil bare on two opposite sides of the armature, said sides forming oradapted to form commutator-surfaces, whereby when the conductors at oneside become worn the armature may be reversed, so that thecommutator-brushes will bear on the opposite side, substantially asdescribed.

This specification signed and witnessed this 22d day of January, 1892.

EMIL KOLBEN.

lVitnesses: FREDERICK BATHURST, GEORGE H. RUPLEY.

